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

using namespace std;

char a[20000];

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");

    int i,c=0,l=0;
    fin.get(a, 20000);
    for(i=1;i<=strlen(a);i++)
        if(((a[i]>=65)&&(a[i]<=90))||((a[i]>=97)&&(a[i]<=122))) l++;
        else if(((a[i-1]>=65)&&(a[i-1]<=90))||((a[i-1]>=97)&&(a[i-1]<=122))) c++;
    fout<<l/c;
}