Task: Program Execution
Input (English): 2691, l, Y, 389, 9525, e, 4805, 6835, 8623, u, 5977, t, 201, y, I, 8759, 5791, n, c, 2839, j, o
Output (English): 1, 4, 5, 7, 8, 9, 11, 13, 16, 17, 20