#include<bits/stdc++.h> using namespace std; char s[1000000]; int main(){ cin.getline (s,1000000); int sum = 0; int sl = strlen(s); for(int i = 0;i < sl;i++){ if(s[i] >= '0' && s[i] <= '9'){ sum++; } } cout << sum; return 0; }