Task: Program Execution
Input (English): 2121, l, e, 8915, 2031, v, c, 3975, X, v, e, d, W, A, 3201, P, r, 7269, o, 5579, P, z
Output (English): 2121, 8915, 2031, 3975, 3201, 7269, 5579