Task: Program Execution
Input (English): c 9953 1029 8523 u d b n i k 7955 8071 5575 x 1855 7763 5353 9939 5377 l z e k 2845 8601 v 8813 u 2357 1481 t 1219
Output (English): b, c, d, e, i, k, l, n, t, u, v, x, z