#include<bits/stdc++.h> using namespace std; int main() { string s; getline(cin,s); int sum=0; for(int i=0;i<s.size();i++){ if(s[i]>=48&&s[i]<=57)sum++; if(s[i]>='A'&&s[i]<='Z')sum++; if(s[i]>='a'&&s[i]<='z')sum++; } cout<<sum<<endl; return 0; }