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cnt = 0
s = input()
for x in s:
	if '0' <= x <= '9':
		cnt += 1
print(cnt)

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s=input()
count=0
for char in s:
    if char.isdigit():
        count+=1
    print(count)

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word = input()
sum = 0
for letter in word:
    for i in range(9):
        i = str(i)
        if letter == i:
            sum += 1
print(sum)

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'0' <= x <= '9' 
'0' <= x and x <= '9' 
x.isdigit() 
x in '0123456789'

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# 错的
s = input()
for x in s:
  if x == '0' or '1' or '2' ...