#include <stdio.h>

int main(){
    char s[101];
    scanf("%s",s);

    int cnt=0, i=0;
    while(s[i]!='\0'){
        if(s[i]=='d' && s[i+1]=='z' && s[i+2]=='='){
            i+=3;
        }
        else if(
            s[i]=='c' && s[i+1]=='=' || s[i+1]=='-' ||
            s[i]=='d' && s[i+1]=='-' ||
            s[i]=='l' && s[i+1]=='j' ||
            s[i]=='n' && s[i+1]=='j' ||
            s[i]=='s' && s[i+1]=='=' ||
            s[i]=='z' && s[i+1]=='='
        ){
            i+=2;
        }
        else{
            i++;
        }
        cnt++;
    }

    printf("%d",cnt);

    return 0;
}