/* Counts only the numeric characters '0' - '9'
   read from standard input */

#include <iostream>
int main( void )
{
    int n = 0;
    char c;

    while ( ( std::cin >> c ) ) {
        if ( c >= '0' && c <= '9' )
            n = n + 1;
    }
    std::cout << "Count of digits = " << n << '\n';
}