#include <iostream>
#include <string>
#include <vector>
using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;
 
int main(int argc, const char * argv[])
{
 
	vector<int> ivec;
	int input;
	while (cin >> input)
	{
		ivec.push_back(input);
	}
 
	if (ivec.size() % 2 == 0)	// if even # of elements
	{
		for (vector<int>::size_type index = 0; index < ivec.size()/2; ++index)
		{
			cout << ivec[index] << "+" << (ivec.size()-index) << endl;
		}
	}
	else				// if odd # of elements
	{
		cout << "---\n" << "Odd # of elements\nLast value is: " << ivec.size()-1 << endl;
	}
 
	return 0;
}

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