#include<iostream>
using namespace std;

int strlen(char* s)
{
   int l =0;
/*
   while (*s != '\0')
   {   l++;
        s++;
    }
*/
    for (; *s != '\0'; l++, s++)
       ;

    return l;
    
}

int main()
{
    char s[20];
    cin.getline(s, 19, '\n');
    cout << strlen(s) <<endl;
       
    system("pause");
    return 0;
}//end main