Task: Program Execution
Input (English): 7255, r, f, 6251, 3079, 679, 2379, 6267, 145, 6721, X, x, 3375, q, g, 7683, Z, 9945, p, 8821
Output (English): r, f, X, x, q, g, Z, p, 7255, 6251, 3079, 679, 2379, 6267, 145, 6721, 3375, 7683, 9945, 8821