Task: Program Execution
Input (English): a q i 1877 4817 6047 y 6865 q y z e a u 4543 g j l k o 9677 8835 2981 7821 7475 n 2941 6303 o w b y 2369
Output (English): a, b, e, g, i, j, k, l, n, o, q, u, w, y, z