Task: Program Execution
Input (English): caoytlbTrKbQQIvqmAaZvxsNAergIPNSFC, dEKbQQIvqmAaZvxsNxUOEG
Output (English): a, b, c, e, f, g, i, k, l, m, n, o, p, q, r, s, t, v, x, y, z