#include <iostream>
#include <stdlib.h>
using namespace std;

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;
}