#include <iostream>
#include <string>
#include <cmath>

using namespace std;

int main() {
    long long n;
    cin >> n;

    int digits = 0;
    long long temp = n;
    while (temp > 0) {
        temp /= 10;
        digits++;
    }

    string level;
    if (digits == 5) {
        level = "wan";
    } else if (digits == 6) {
        level = "shiwan";
    } else if (digits == 7) {
        level = "baiwan";
    } else if (digits == 8) {
        level = "qianwan";
    } else if (digits == 9 || digits == 10) {
        if (digits == 9) {
            level = "yi";
        } else {
            level = "shiyi";
        }
    }

    cout << level << endl;

    return 0;
}
/**************************************************************
	Problem: 1322
	User: fuhoubin
	Language: C++
	Result: Wrong Answer
****************************************************************/