'How to find the length and proportion of nucleotides in a DNA sequence using R

Hi so I have a DNA sequence and need to find the length and nucleotide proportions. This should be easy using table() and length() however the way the file is formatted is making this difficult. R is reading it in not as a single sequence but 1 variable with 20 objects. How do I get around this?

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P_acuticauda         GCCATTTCATCCCAGCACAAACCTGGGAGCTCCAGCTGTGTCTGGAAAGCTTCGATGGGATCCCACCAGTCTGCAAAGCTTTTGTGTCAGGTATAGAGAT
P_hecki         GCCATTTCATCCCAGCACAAACCTGGGAGCTCCAGCTGTGTCTGGAAAGCTTCGATGGGATCCCACCAGTCTGCAAAGCTTTTGTGTCAGGTATAGAGAT
P_cincta         GCCATTTCATCCCAGCACAAAGCTGGGAGCTCCAGCTGTGGCTGGAAAGCTTCGATGGGATCCCACCAGTCTGCAAAGCTTTTGTGTCAGGTATAGAGAT
T_guttata         GCCATTTCATCCCAGCACAAAGCTGGGAGCTCCAGCTGTGGCTGAAAAACTTCGATGGGATCCCACCGGTCTGCAAAGCTTTTGTGTCAGGTATAGAGAT

TGATGCATCAGCCTTGGGCTCTCAGAAATGCACCTGGTTTGTAGTGAATGTGAGATGTGTAACTGCTTAGTCAAGGACAAACCTTTTTCCTATTCTCCTC
TGATGCATCAGCCTTGGGCTCTCAGAAATGCACCTGGTTTGTAGTGAATGTGAGATGTGTAACTGCTTAGTCAAGGACAAACCTTTTTCCTATTCTCCTC
TGATGCATCAGCCTTGGGCTCTCAGAAATGCACCTGGTTTGTAGTGAATGTGAGATGTGTAACTGCTTAGTCAAGGACAAACCTTTTTCCTATTCTCCTC
TGATGCATCAGCCCTGGGCTCTCAGAAATGCACCTGGTTTGTAGTGAATGTGAGATGTGTAACTGCTTAGTCAAGGACAAACCTTTTTCCTATTCTCCTC

TCTGTACTGGCTTTTAAAATGTAGTATTTAGTGAAAAAAAACTCTCAATGATGTGTGTGCTACAAACCAGTTGTCCCAGTCAAAGCTATTTCAATAAGCA
TCTGTACTGGCTTTTAAAATGTAGTATTTAGTGAAAAAAAAGTCTCAATGATGTGTGTGCTACAAACCAGTTGTCCCAGTCAAAGTTATTTCAATAAGCA
TCTGTACTGGCTTTTAAAATGTAGTATTTAGTGAAAAAAAACTCTCAATGATGTGTGTGCTACAAACCAGTTGTCCCAGTCAAAGTTATTTCAATAAGCA
TCTATATTGGCTTTTAAAATGCAGTATTTAGTGAAAAAAAAGTCTCAATGATTTGTGTGCTACAAACCAGTTGTCCCAGTCAAAGTTATTTCAATAAGCA

GGAAATAATTTCTGTTATAACTTCAATTTTCAAGAACAGATTTTCTTGACTTGATTGCTTAAAATTGTTTGGGTTTATGTGGTGTTTTTTACCATTTGCA
GGAAATAATTTCTGTTATAACTTCAGTTTTCAAGAACAGATTTTCTTCACTTGATTGCTTAAAATTGTTTGGGTTTATGTGGTGTTTTTTACCATTTGCA
GGAAATAATTTCTGTTATAACTTCAATTTTCAAGAACAGATTTTCTTGACTTGATTGCTTAAAATTGTTTGGGTTTATGTGGTGTTTTTTACCATTTGCA
GGAAATTATTTCTTTTATAACTTCAATTTTCAAGAACAGATTTTCTTGACTTGATTGCTTAAAATTGTTTGGGTTTATGTGGTGTTTTGTACCATTTGCA

CCAGTTTAATGTGTACAGCATTTTTTTTTTTTCTGGATTCTTTCTAGAAACTTAACCTACAAAGAGGAAAGACTTTTTTATTGTCTTGAGGTGTGTTCAG
CCAGTTTAATGTGTACAGCATTTTTTTTTTTTCTGGATTCTTTCTAGAAACTTAACCTACAAAGAGGAAAGACTTTTTTATTGTCTTGAGGTGTGTTCAG
CCAGTTTAATGTGTACAGCATTTTTTTTTTTTCTGGATTCTTTCTAGAAACTTAACCTACAAAGAGGAAAGACTTTTTTATTGTCTTGAGGTGTGTTCAG
CCAGTTTAATGTGTACAGCATTTTTTTTTTTTCTGGATTCTTTCTAGGAACTTAACCTACAAAGAGGAAAGACTTTTTTATTGTCTTGAGGTGTGTTCAG

AAAAAGTAAAATAGATCTTTTGGAAAAAGACCTGTGATCAGATTTTTGCGAAGCAAAA
AAAAAGTAAAATAGATCTTTTGGAAAAAGACCTGTGATCAGATTTTTGCGAAGCAAAA
AAAAAGTAAAATAGATCTTTTGGAAAAAGACCTGTGATCAGATTTTTGCGAAGCAAAA
AAAAAGTAAAATAGATCTTTTGGAAAAAGACCTGTGATCAGATTTTTGCTAAGCAAAA


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