#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;

char a[2000000];
long int i,c,l;

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    fin.get(a, 20000, EOF);
    for(i=0;i<=strlen(a);i++)
        if(((a[i]>=65)&&(a[i]<=90))||((a[i]>=97)&&(a[i]<=122))) l++;
        else if((a[i-1]!=0)&&((a[i-1]>=65)&&(a[i-1]<=90))||((a[i-1]>=97)&&(a[i-1]<=122))) c++;
    fout<<l/c;
}