Task: Program Execution
Input (English): z, m, k, c, 5677, C, X, i, x, d, 6389, x, 8441, 3913, 5877, 1615, 2935, y
Output (English): z, m, k, c, C, X, i, x, d, x, y, 5677, 6389, 8441, 3913, 5877, 1615, 2935