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#include <iostream>
#include <string>

int main(void){
    int count = 0;
    for (int i=0; i<5; i++)
    {
        std::string buffer;
        std::cin >> buffer;
        count += (buffer=="yes")?1:-1;
    }
    
    std::cout << ((count>0)?"yes":"no");
    
    return 0;
}