import Foundation

let dna = """
          CGTAAAAAATTACAACGTCCTTTGGCTATCTCTTAAACTCCTGCTAAATG
          CTCGTGCTTTCCAATTATGTAAGCGTTCCGAGACGGGGTGGTCGATTCTG
          AGGACAAAGGTCAAGATGGAGCGCATCGAACGCAATAAGGATCATTTGAT
          GGGACGTTTCGTCGACAAAGTCTTGTTTCGAGAGTAACGGCTACCGTCTT
          CGATTCTGCTTATAACACTATGTTCTTATGAAATGGATGTTCTGAGTTGG
          TCAGTCCCAATGTGCGGGGTTTCTTTTAGTACGTCGGGAGTGGTATTATA
          TTTAATTTTTCTATATAGCGATCTGTATTTAAGCAATTCATTTAGGTTAT
          CGCCGCGATGCTCGGTTCGGACCGCCAAGCATCTGGCTCCACTGCTAGTG
          TCCTAAATTTGAATGGCAAACACAAATAAGATTTAGCAATTCGTGTAGAC
          GACCGGGGACTTGCATGATGGGAGCAGCTTTGTTAAACTACGAACGTAAT
          """

print("input:\n\(dna)\n")

let counts =
  dna.replacingOccurrences(of: "\n", with: "").reduce(into: [:], { $0[$1, default: 0] += 1 })

print("Counts: \(counts)")
print("Total: \(counts.values.reduce(0, +))")