Task: Program Execution
Input (English): 1321, 3331, A, 3913, B, 1599, f, 9513, 1983, K, 1085, Z, 5787, 8111, 8801, 2095, U, 4369, 5511, 6687, R, Q, u
Output (English): A, B, f, K, Z, U, R, Q, u, 1321, 3331, 3913, 1599, 9513, 1983, 1085, 5787, 8111, 8801, 2095, 4369, 5511, 6687