def countNucFrequency(seq):
tmpFreDict = {"A": 0, "C": 0, "G": 0, "T": 0}
for nuc in seq:
tmpFreDict[nuc] += 1
return tmpFreDict
DNAString = "AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC"
result = countNucFrequency(DNAString)
print(' '.join([str(val) for key, val in result.items()]))20 12 17 21