Task: Program Execution
Input (English): b, 6259, B, e, 5873, 4533, Z, 2807, A, 6575, 2063, r, 2081, z, 8657, i, 2261, V, 1149, 3531, g, a
Output (English): 2, 5, 6, 8, 10, 11, 13, 15, 17, 19, 20