#include<iostream> using namespace std; int main(){ string s; getline(cin,s); int y=s.size(); int n=0; for(int i=0;i<y;i++){ if(s[i]=='1'||s[i]=='2'||s[i]=='3'||s[i]=='4'||s[i]=='5'||s[i]=='6'||s[i]=='7'||s[i]=='8'||s[i]=='9'||s[i]=='0'){ n++; } } cout<<n; }