#include<cstdio>
#define CLOSE fclose(in); fclose(out); return 0;

using namespace std;

int verif(char c){
    if(c>='A' && c<='Z')
        return 1;
    if(c>='a' && c<='z')
        return 1;
    return 0;
}

int main(){
    FILE *in=fopen("text.in","r");
    FILE *out=fopen("text.out","w");

    char c=fgetc(in);
    int st=0,nrc=0,nrl=0;
    while(c!=EOF){
        if(st==0 && verif(c)){
            nrl++;
            nrc++;
            st=1;
        } else if(st==1 && verif(c))
            nrl++;
        else if(st==1 && !verif(c))
            st=0;
        c=fgetc(in);
    }
    if(nrc)
        fprintf(out,"%d",nrl/nrc);
    else
        fprintf(out,"0");
    CLOSE

}