#include <stdio.h>
int num, cuv;

int main()
{
	char c;
    int ex = 0;
    freopen("text.in", "r", stdin);
    freopen("text.out", "w", stdout);
    while ( scanf("%c",&c) != EOF)
    {
    	if ( ( c >= 'a' && c <= 'z') || ( c >= 'A' && c <= 'Z') )
        	num++, ex = 1;
        else
        	{
            	if ( ex == 1)
                	cuv++;
            	ex = 0;

            }
    }
    printf("%d", num / cuv );
    return 0;
}