Task: Program Execution
Input (English): l, 913, n, 8669, m, 7721, d, 4347, 4029, 5615, 6235, x, 8123, 6441, x, 1761, c, 8575, z, t, k, j, 5095
Output (English): c, d, j, k, l, m, n, t, x, z