#include <stdio.h>
#include <string.h>
#include <fstream>
using namespace std;

int main()
{
    int nrlit=0,nrcuv=0,i,n;
    char s[1000];
    FILE *f=fopen("text.in","r");
    FILE *g=fopen("text.out","w");
    fgets(s,1000,f);
    s[strlen(s)-1]=NULL;
    n=strlen(s);
    for(i=0; i<n; i++)
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
            nrlit++;
    i=0;
    while(i<n)
    {
        while(!((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))&&i<n)
            i++;
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
            nrcuv++;
        while(((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))&&i<n)
            i++;

    }
   // g<<nrlit<<" "<<nrcuv<<endl;
    fprintf(g,"%d",nrlit/nrcuv);
    return 0;
}