#include<bits/stdc++.h> using namespace std; int main(){ char a[255]; cin>>a; int sum=0; for(int i=0;i<255;i++){ if(a[i]=='1'||a[i]=='2'||a[i]=='3'||a[i]=='4'||a[i]=='5'||a[i]=='6'||a[i]=='7'||a[i]=='8'||a[i]=='9'){ a[i]==sum; sum=sum+1; }else{ continue; } } cout<<sum; return 0; }