11v1

#include <fstream>
#include <iostream>
using namespace std;

int main()
{
    ifstream F("input1.txt");
    ifstream G("input2.txt");
    ofstream H("out.txt");
    if (!F || !G)
    {
        cout << "can't open file";
    }

    int num1, num2;
    F >> num1;
    G >> num2;
    while (F.peek() != EOF && G.peek() != EOF)
    {
        if (num1 == num2)
        {
            F >> num1;
            G >> num2;
        }
        if (num1<num2)
        {
            H << num1 << " ";
            F >> num1;
        }
        else
            if (num1 != num2)
            {
                H << num2 << " ";
                G >> num2;
            }

    }
    if (F.peek() == EOF)
    {
        while (G.peek() != EOF && num2 < num1)
        {
            {
                if (num1 != num2)
                    H << num2 << " ";
                G >> num2;
            }
        }
        if (num2 < num1)
            if (num1 != num2)
                H << num2 << " " << num1 << " ";

            else
                if (num1 != num2)
                    H << num1 << " " << num2 << " ";

        while (G.peek() != EOF)
        {
            G >> num2;
            if (num1 != num2)
                H << num2 << " ";
        }
    }
    else
    {
        while (F.peek() != EOF && num1 < num2)
        {
            if (num1 != num2)
                H << num1 << " ";
            F >> num1;
        }
        if (num2 < num1)
            H << num2 << " " << num1 << " ";

        else
            if (num1 != num2)
                H << num1 << " " << num2 << " ";

        while (F.peek() != EOF)
        {
            F >> num1;
            if (num1 != num2)
                H << num1 << " ";
        }
    }
    return 0;
}