#include<stdio.h>
using namespace std;
//ifstream f("text.in");
//ofstream g("text.in");
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 == '-' || x == ',' || x == '.' || x == ' ' || x == '!' || x == '?' || x == ';' || x == ':' || x == '\n'){
        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;
}