#include <iostream>
#include <cstdio>
#include <cctype>
using namespace std;

int main()
{
    long long nrcuv=0,len=0,sol=0;
    int ok=0;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    char c;
    while( scanf("%c",&c))
    {
        if(isalpha(c)) { len++; ok=1; }
        else
            if(ok)
            {
                ok=0;
                nrcuv++;
            }
        if(c=='\n') break;
    }
    cout<<len/nrcuv;
}