Task: Program Execution
Input (English): b e 5523 f m 4891 31 l q f 6397 1815 9537 5279 1837 w j 2479 k x 423 e 6475 o g 99 6821 j 27 9565 c i 5015 5365 z
Output (English): b, c, e, f, g, i, j, k, l, m, o, q, w, x, z