#include<bits/stdc++.h> using namespace std; int main (){ char s[1000001]; cin.getline(s,1000001); int i = 0,sum = 0; while(s[i] != '\0') { if(s[i] >= '0' && s[i] <= '9') { sum++; i++; } else { i++; continue; } } cout << sum; return 0; }