#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n>=10000&&n<100000){
        cout<<"wan";
    }else if(n>=100000&&n<1000000){
        cout<<"shi wan";
    }else if(n>=1000000&&n<10000000){
        cout<<"bai wan";
    }else if(n>=10000000&&n<100000000){
        cout<<"qian wan";
    }else if(n>=100000000&&n<1000000000){
        cout<<"yi";
    }else{
        cout<<"shi yi";
    }
     
}
/**************************************************************
	Problem: 1322
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/