rosalind_counting_DNA_nucleotides.nim

var data: string = "AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC"

var
  A: int = 0
  C: int = 0
  G: int = 0
  T: int = 0
  
for letter in data:
  if letter == 'A':
    A = += 1
  elif letter = 'C':
    C = += 1
  elif letter = 'G':
    G = += 1
  elif letter = 'T':
    T = += 1
    
echo($A, $C, $G, $T)