Task: Program Execution
Input (English): R, X, e, 5923, 4059, 6317, 9561, 5951, 9653, e, S, P, 6907, 4993, E, 1875, a
Output (English): R, X, e, e, S, P, E, a, 5923, 4059, 6317, 9561, 5951, 9653, 6907, 4993, 1875