c-guzman

var data: string = "AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC"

var
  A: int = 0
  C: int = 0
  G: int = 0
  T: int = 0
  
for letter in data:
  if letter == 'A':

c-guzman

# counting point mutations
# count all mutations where C != C, G !=G, A != A, and T != T
import algorithm

# define string variables
var s: string = "GAGCCTACTAACGGGAT"
var t: string = "CATCGTAATGACGGCCT"

# define count variable for number of mutations
var mutations: int = 0