#include<cstdio>
int nrl,nrc;
bool letter(char c){
    return 'a'<=c&&c<='z'||'A'<=c&&c<='Z';
}
int main(){
    char c,cc;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    scanf("%d",&c);
    nrc+=letter(c);
    cc=c;
    while(scanf("%c",&c)!=EOF){
        if(letter(c))
            nrl++;
        if(!letter(cc)&&letter(c))
            nrc++;
        cc=c;
    }
    printf("%d",nrl/nrc);
    return 0;
}