# include <bits/stdc++.h>

using namespace std;
int x,y,a,n;string s;

int main(){
	cin>>n;
	for(int i = 1;i<=n;i++){
		cin>>a;
		x+=(i&1)*a;
		y+=(1-(i&1))*a;
	}
	cout<<x<<'\n'<<y<<'\n'<<abs(x-y);
	return 0;
}

这题表达有问题