Task: Program Execution
Input (English): 1509, 8739, W, 5287, 503, S, s, u, X, T, x, 7725, e, i, 2801, e, c, 8971, 8753, J, 3755, Q, 9911
Output (English): W, S, s, u, X, T, x, e, i, e, c, J, Q