#include <iostream>
#include <algorithm>

int main() {
    int a, b, c;
    std::cin >> a >> b >> c;
    // 将三边存入数组并排序
    int sides[3] = {a, b, c};
    std::sort(sides, sides + 3);

    // 判断能否构成三角形
    if (sides[0] + sides[1] <= sides[2]) {
        std::cout << "no" << std::endl;
    } else {
        // 计算两短边平方和与长边平方
        int sumOfSquares = sides[0] * sides[0] + sides[1] * sides[1];
        int longestSquare = sides[2] * sides[2];

        // 判断三角形类型
        if (sumOfSquares == longestSquare) {
            std::cout << "zhijiao" << std::endl;
        } else if (sumOfSquares < longestSquare) {
            std::cout << "dunjiao" << std::endl;
        } else {
            std::cout << "ruijiao" << std::endl;
        }
    }

    return 0;
}    
/**************************************************************
	Problem: 1018
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/