11a

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

int main() {
    ifstream F("in1.txt");
    ifstream G("in2.txt");
    if (!F || !G)
    {
        cout << "can't open file";
    }
    ofstream H("out.txt");
    int x, y;
    F >> x;
    G >> y;
    while (F.peek() != EOF && G.peek() != EOF)
{
        if (x<y)
        {
            H << x << " ";
            F >> x;
        }
        else
        {
            if (x != y)
                H << y << " ";
                G >> y;
        }
    }
    if (F.peek() == EOF)
    {
        while (G.peek() != EOF && y < x)
        {
            {
                if (x != y)
                H << y << " ";
                G >> y;
            }
        }
        if (y < x)
        {
            if (x != y)
            H << y << " " << x << " ";
        }
        else
        {
            if (x != y)
            H << x << " " << y << " ";
        }
        while (G.peek() != EOF)
        {
            {
                G >> y;
                if (x != y)
                H << y << " ";
            }
        }
    }
    else
    {
        while (F.peek() != EOF && x < y)
        {
            {
                if (x != y)
                H << x << " ";
                F >> x;
            }
        }
        if (y < x)
        {
            H << y << " " << x << " ";
        }
        else
        {
            if (x != y)
            H << x << " " << y << " ";
        }
        while (F.peek() != EOF)
        {
            {
                F >> x;
                if (x != y)
                H << x << " ";
            }
        }
    }
    return 0;
}