厉不厉害你坤哥（

#include<bits/stdc++.h>
using namespace std;

int main(){
    string ikun; 
	cin >> ikun;
    int c=0,x=0,k=0;//你干嘛哈哈哎哟
	int len = ikun.size();
    for(int i=0;i<len;i++){
        if(ikun[i]=='c')c++;
        else if(ikun[i]=='p')x++;
        else if(ikun[i]=='d')k++;
    }
    int libulihainikunge=min(c,x);//厉不厉害你坤哥
    libulihainikunge=min(libulihainikunge,k/2);
    cout<<libulihainikunge<<endl;
    return 0;
}