#include <stdio.h>

int main()
{
	int lit = 0, cuv = 0, ok = 0;
	char c;

	freopen("text.in", "r", stdin);
    freopen("text.out", "w", stdout);

    while(!feof(stdin))
    {
    	scanf("%c", &c);
        if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
        {
        	++lit;
        	ok = 1;
        }
        else if (ok)
        {
        	++cuv;
            ok = 0;
        }
    }
    if (ok)
    	++cuv;

    printf("%d\n", lit / cuv);

	return 0;
}