#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

int main() {
    int m, n;
    cin >> m >> n;  // 输入男生和女生的人数

    vector<double> boys(m);
    vector<double> girls(n);

    // 输入男生成绩
    for (int i = 0; i < m; ++i) {
        cin >> boys[i];
    }

    // 输入女生成绩
    for (int i = 0; i < n; ++i) {
        cin >> girls[i];
    }

    // 计算男生平均成绩
    double sum_boys = 0.0;
    for (double score : boys) {
        sum_boys += score;
    }
    double avg_boys = sum_boys / m;

    // 计算女生平均成绩
    double sum_girls = 0.0;
    for (double score : girls) {
        sum_girls += score;
    }
    double avg_girls = sum_girls / n;

    // 输出结果，保留1位小数
    cout << fixed << setprecision(1);
    cout << avg_boys << endl;
    cout << avg_girls << endl;

    return 0;
}

/**************************************************************
	Problem: 1319
	User: mc002
	Language: C++
	Result: Wrong Answer
****************************************************************/