a = input().split()
print(a)
res = 2
if a[0] == a[1] == a[2]:
    res = min(res, 0)
if a[0] == a[1] or a[1] == a[2] or a[0] == a[2]:
    res = min(res, 1)
 
for i in range(3):
    for j in range(3):
        print(a[i][0], a[j][0])
        if int(a[i][0]) + 1 != int(a[j][0]):
            break
        res = min(res, 1)
        for k in range(3):
            if int(a[j][0]) + 1 == int(a[k][0]):
                res = min(res, 0)
print(res)

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MXMgMnMgM3M=

1s 2s 3s