Task: Program Execution
Input (English): 6415, 6353, R, 8727, 5971, l, 6289, 2779, Z, 4259, 9911, U, u, 1281, 4687, d, b
Output (English): R, l, Z, U, u, d, b, 6415, 6353, 8727, 5971, 6289, 2779, 4259, 9911, 1281, 4687