#include <iostream>
using namespace std;
class Complex
{
float real, image;
public:
Complex()
{

}
Complex(float r, float i)
{
real = r;
image = i;
}
void init(float r, float i)
{
real = r;
image = i;
}
friend bool operator<(Complex &c1, Complex &c2)
{
return c1.real < c2.real || (c1.real == c2.real && c1.image < c2.image);
}
friend bool operator>(Complex &c1, Complex &c2)
{
return c1.real > c2.real || (c1.real == c2.real && c1.image > c2.image);
}

friend ostream& operator<<(ostream &o, Complex &c)
{
if (c.image > 0)
return o << c.real << "+" << c.image << "i" << endl;
else
{
if (c.image == 0)
return o << c.real << endl;
else
return o << c.real << c.image << "i" << endl;
}

}
};
class ComplexArray
{
Complex Cs[100];
int n;
public:
ComplexArray(int n)
{
this->n = n;
float r, i;
for (int j = 0; j < n; j++)
{
cin >> r >> i;
Cs[j].init(r, i);
}
}
void Sort()
{
for (int i = 0; i < n - 1; i++)
for (int j = n - 1; j > i; j--)
if (Cs[j - 1] > Cs[j])
{
Complex tmp;
tmp = Cs[j - 1];
Cs[j - 1] = Cs[j];
Cs[j] = tmp;
}
for (int i = 0; i < n; i++)
cout << Cs[i];
}

};
int main()
{
int n;
cin >> n;
ComplexArray CA(n);
CA.Sort();
return 0;
}