import sys

a = ''
b = ''
c = ''

def check(a, b):
    if a == b:
        return True
    if len(a) != len(b):
        return False
    d = 0
    for i in range(len(a)):
        if a[i] != b[i]:
            d += 1
            if d > 1:
                return False
    return d == 1

def cnt(a, b, c):
    d = 0
    if check(a, b):
        d += 1
    if check(b, c):
        d += 1
    if check(a, c):
        d += 1
    return d

if __name__ == '__main__':
    sys.stdin = open('tuongduong.inp', 'r')
    sys.stdout = open('tuongduong.out', 'w')
    a, b, c = input().split()
    print(cnt(a, b, c))

def ktra(a, b):
    return a==b or (len(a)==len(b) and sum(x!=y for x,y in zip(a,b))==1)
def cnt(a,b,c):
    return sum(ktra(x,y) for x,y in [(a,b),(b,c),(a,c)])
if __name__ == '__main__':
    with open('tuongduong.inp') as infile, open('tuongduong.out','w') as outfile:
        a, b, c = infile.read().split()
        outfile.write(f"{cnt(a, b, c)}\n")