#include <stdio.h>
#include <string.h>
#include <ctype.h>
using namespace std;
int nrcuv,nrlit;
int main()
{
    char c,x1,x2;
    FILE *f=fopen("text.in","r");
    fscanf(f,"%c",&c);
    x1=c;
    if(isalpha(c))
       nrlit++;
    while(!feof(f))
    {
       x2=x1;
       fscanf(f,"%c",&c);
       x1=c;
       if(!isalpha(x1)&&isalpha(x2))
       nrcuv++;
       if(isalpha(c))
       nrlit++;
    }
    f=fopen("text.out","w");
    fprintf(f,"%d",nrlit/nrcuv);
    return 0;
}