#include <stdio.h>
#include <stdlib.h>

char ch;
int nrlitere=0;
int nrcuv=0;

void verif(){

    if(ch=='\n'){
        if(nrcuv==0){
            printf("0");
            exit(0);
        }
        printf("%d",nrlitere/nrcuv);
        exit(0);
    }

}
int main(){


    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);

    while(3){
        verif();
        while((ch>'z' || ch<'a') && (ch>'Z' || ch<'A')){
            scanf("%c",&ch);
            verif();
        }
        nrcuv++;
        while(3){
            if(!((ch>'z' || ch<'a') && (ch>'Z' || ch<'A'))){
                nrlitere++;
            }else{
                break;
            }
            verif();
            scanf("%c",&ch);
        }
    }
    printf("%d",nrlitere/nrcuv);


    return 0;
}