number = input()
n = []
N = 0
max = 1
for i in range(len(number)):
    n.append(number[i])
N = len(n)
for i in range(N-1):
    for j in range(N-i-1):
        if n[j+1] < n[j]:
            n[j], n[j+1] = n[j+1], n[j]
i = 1
if N == 1:
    pass
else:
    while n[0] == n[i]:
        max += 1
        i += 1
print(max)