#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: zhengzihao3
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/