#include<stdio.h>
using namespace std;
FILE *f=fopen("text.in","r"), *g=fopen("text.out","w");
char x,y;
int nrcuv,nrlitere;
int main(){
fscanf(f,"%c",&y);
if(y>='a'&&y<='z' || y>='A' && y<='Z')
    nrlitere++;
    while(fscanf(f,"%c",&x)!= EOF ){
        if(!(x>='a' && x<='z' || x>='A' && x<='Z')){
            if(y>='a' && y<='z' || y>='A' && y<='Z')
                nrcuv++;
                }
                else
            nrlitere++;
            y=x;
    }
    fprintf(g,"%d", nrlitere/nrcuv);
 return 0;
}