n, m = map(int, input().split())
if n > 2:
    print(0)
else:
    s1 = input().strip()
    s2 = input().strip()
    count = 0

    # Check condition A: s1 is prefix, s2 is suffix
    prefix_part = s1[1:]
    suffix_char = s2[-1]
    if prefix_part + suffix_char == s2:
        count += 1

    # Check condition B: s2 is prefix, s1 is suffix
    prefix_part_b = s2[1:]
    suffix_char_b = s1[-1]
    if prefix_part_b + suffix_char_b == s1:
        count += 1

    print(count)