F1

#include <stdio.h>


int main()
{
    FILE *inFile = fopen("input.txt", "r");
    FILE *outFile = fopen("output.txt", "w");
    char secret_word[15];
    for (int i = 0; i < 15; ++i)
        secret_word[i] = 0;
    fscanf(inFile, "%s", secret_word);
    int word_length = 0;
    for (int i = 0; i < 15; ++i)
    {
        if (secret_word[i] != 0)
            word_length++;
    }

    char input_word[20];
    for (int i = 0; i < 20; ++i)
        input_word[i] = 0;
    fscanf(inFile, "%s", input_word);


    char result[15];
    for (int i = 0; i < 15; ++i)
        result[i] = '.';


    for (int i = 0; i < 20; ++i)
    {
        for (int j = 0; j < 15; ++j)
        {
            if (input_word[i] == secret_word[j] && input_word[i] != 0)
            {
                result[j] = result[j] == '.' ? secret_word[j] : '.';
            }
        }
    }

    for (int i = 0; i < word_length; ++i)
        fprintf(outFile, "%c", result[i]);

    fclose(inFile);
    fclose(outFile);


    return 0;
}