#include<stdio.h>
using namespace std;
FILE *f=fopen("text.in","r"),
    *g=fopen("text.out","w");
char l1,l2;
int nr1,nr;
int main()
{
    fscanf(f,"%c",&l1);
    if(l1>='a'&&l1<='z'||l1<='Z'&&l1>='A')
       nr1++;
    while(fscanf(f,"%c",&l2)!=EOF){
        if(l2>='a'&&l2<='z'||l2<='Z'&&l2>='A'){
            nr1++;
        }
        else{
            if(l1>='a'&&l1<='z'||l1<='Z'&&l1>='A')
                    nr++;

        }
        l1=l2;
    }
    fprintf(g,"%d",nr1/nr);
    return 0;
}