def sequence_compare(seq_a, seq_b):
    len1 = len(seq_a)
    len2 = len(seq_b)
    mismatches = []
    for pos in range (0,min(len1,len2)):
        if seq_a[pos] != seq_b[pos]:
            mismatches.append('|')
        else:
            mismatches.append(' ')
    print(seq_a)
    print(mismatches)
    print(seq_b)
sequence_compare(seq_a,seq_b)