I have input file contains multiple nucleotide sequences in fasta format. I am using a standalone Linux version of ORFfinder using following command:

/Path/ORFfinder -in /Path_to_input_file/input_file.fasta -s 0 -out output_fasta -outfmt 0

This generates output file containing all ORF, but I am only interested in the longest ORF (ORF having maximum length). For example, one of the nucleotide sequence from my input file is:

BnaA03g18710D ACCAACATCTATTTTCCATCTTTTCCGATCAAAATCTCTCTCTCTCTCTCAGCTTTTTGTGTGACGCAACACTCGTGGGGAAATGGCCGCCGCAGTTTCCACCGTCGGTGCCATCAACAGAGCTCCGTTGAGCTTGAACGGGTCAGGAGCAGGAGCTGCTTCAGTCCCAGCTACGACCTTCTTGGGAAAGAAAGTTGTAACCGCGTCGAGATTCACACAGAGCAACAACAAGAAGAGCAACGGATCATTCAAAGTGGTCGCTGTCAAAGAAGACAAACAAACCGATGGAGACAGATGGAGGGGACTTGCCTACGACACGTCTGATGATCAACAAGACATCACCAGAGGCAAAGGTATGGTTGACTCTGTCTTCCAAGCTCCCATGGGAACCGGAACTCACAATGCCGTTCTTAGCTCCTATGAGTACATTAGCCAAGGTCTTAAGCAGTACAACTTGGACAACATGATGGATGGGCTTTACATTGCTCCTGCATTCATGGACAAGCTTGTTGTTCACATCACCAAGAACTTCTTGACTTTACCTAACATCAAGGTTCCACTTATTTTGGGTATTTGGGGAGGCAAAGGTCAAGGTAAATCCTTCCAGTGTGAGCTTGTCATGGCCAAGATGGGCATTAACCCAATCATGATGAGTGCTGGAGAGCTTGAGAGTGGAAACGCAGGAGAACCAGCCAAGCTGATCCGTCAAAGGTACCGTGAAGCAGCAGACATGATCAAAAAGGGAAAAATGTGTTGTCTATTCATCAACGATCTCGACGCTGGTGCTGGTCGTATGGGTGGTACTACTCAGTACACAGTCAACAACCAGATGGTTAACGCAACCCTCATGAACATTGCTGATAACCCAACCAACGTCCAGCTCCCGGGAATGTACAACAAGGAAGAAAACGCACGTGTCCCCATCATCGTCACCGGTAACGATTTCTCCACTCTCTACGCACCTCTCATCCGTGACGGGCGTATGGAGAAATTCTACTGGGCACCCACACGTGAGGACCGTATTGGTGTCTGCAAGGGTATCTTCAGGACTGATAACGTTAAGGATGAAGACATTGTCACGCTTGTTGACCAGTTCCCTGGACAATCTATCGATTTCTTTGGTGCATTGAGGGCGAGAGTGTACGATGATGAAGTGAGGAAGTTCGTTGAGGGACTTGGAGTTGAGAAGATAGGAAAGAGGCTGGTGAACTCTAGGGAAGGTCCTCCAGTGTTCGAGCAGCCAGCGATGACTCTTGAGAAGCTTATGGAGTACGGAAACATGCTTGTGATGGAACAAGAGAACGTCAAGAGAGTCCAACTTGCTGACCAATACCTTAACGAGGCTGCCTTGGGAGACGCAAACGCGGACGCCATTGGCCGCGGAACTTTCTATGGGAAAGCAGCACAGCAAGTGAACCTCCCTGTTCCAGAAGGGTGTACTGATCCTCAAGCAGACAACTTTGATCCAACAGCTAGAAGTGATGATGGAACTTGTGTCTACAACTTTTGAGTTTCCCCTTTGTTAAGTTGCTGTGTTTCTACTACTGTCTCTTTTTTTTGTTGCCTTTTGTGTAATTTTGGATTGCTTCATGTACTCTCTTTTTTTGTGATCATGTGCAAACATTAATATTGTAAGATTCCCTTGTCATAAACCATTTCTCAACTTTTTGTTTGCTTTATTAAGTAGATGGCATTCCAACTATAGTTCTTTGGCCATAGTCTCGGAA

This generates following output in the form of 5 ORF:

lcl|ORF1_BnaA03g18710D:82:1509 unnamed protein product

MAAAVSTVGAINRAPLSLNGSGAGAASVPATTFLGKKVVTASRFTQSNNKKSNGSFKVVAVKEDKQTDGD RWRGLAYDTSDDQQDITRGKGMVDSVFQAPMGTGTHNAVLSSYEYISQGLKQYNLDNMMDGLYIAPAFMD KLVVHITKNFLTLPNIKVPLILGIWGGKGQGKSFQCELVMAKMGINPIMMSAGELESGNAGEPAKLIRQR YREAADMIKKGKMCCLFINDLDAGAGRMGGTTQYTVNNQMVNATLMNIADNPTNVQLPGMYNKEENARVP IIVTGNDFSTLYAPLIRDGRMEKFYWAPTREDRIGVCKGIFRTDNVKDEDIVTLVDQFPGQSIDFFGALR ARVYDDEVRKFVEGLGVEKIGKRLVNSREGPPVFEQPAMTLEKLMEYGNMLVMEQENVKRVQLADQYLNE AALGDANADAIGRGTFYGKAAQQVNLPVPEGCTDPQADNFDPTARSDDGTCVYNF

lcl|ORF2_BnaA03g18710D:284:466 unnamed protein product

METDGGDLPTTRLMINKTSPEAKVWLTLSSKLPWEPELTMPFLAPMSTLAKVLSSTTWTT

lcl|ORF3_BnaA03g18710D:1623:1522 unnamed protein product

MFAHDHKKREYMKQSKITQKATKKRDSSRNTAT

lcl|ORF4_BnaA03g18710D:1373:993 unnamed protein product

MASAFASPKAASLRYWSASWTLLTFSCSITSMFPYSISFSRVIAGCSNTGGPSLEFTSLFPIFSTPSPST

NFLTSSSYTLALNAPKKSIDCPGNWSTSVTMSSSLTLSVLKIPLQTPIRSSRVGAQ

lcl|ORF5_BnaA03g18710D:926:807 unnamed protein product

MMGTRAFSSLLYIPGSWTLVGLSAMFMRVALTIWLLTVY

But I am only interested in Longest ORF which is:

lcl|ORF1_BnaA03g18710D:82:1509 unnamed protein product

MAAAVSTVGAINRAPLSLNGSGAGAASVPATTFLGKKVVTASRFTQSNNKKSNGSFKVVAVKEDKQTDGD RWRGLAYDTSDDQQDITRGKGMVDSVFQAPMGTGTHNAVLSSYEYISQGLKQYNLDNMMDGLYIAPAFMD KLVVHITKNFLTLPNIKVPLILGIWGGKGQGKSFQCELVMAKMGINPIMMSAGELESGNAGEPAKLIRQR YREAADMIKKGKMCCLFINDLDAGAGRMGGTTQYTVNNQMVNATLMNIADNPTNVQLPGMYNKEENARVP IIVTGNDFSTLYAPLIRDGRMEKFYWAPTREDRIGVCKGIFRTDNVKDEDIVTLVDQFPGQSIDFFGALR ARVYDDEVRKFVEGLGVEKIGKRLVNSREGPPVFEQPAMTLEKLMEYGNMLVMEQENVKRVQLADQYLNE AALGDANADAIGRGTFYGKAAQQVNLPVPEGCTDPQADNFDPTARSDDGTCVYNF

How can I output or extract only the longest ORF?

Any help will be highly appreciated.