Task: Program Execution
Input (English): 2, 15, ['J', 'e', 'f', 'B', 'j', '7319', 'o', 'O', '3981', 's', '1249', '9693', 'u', 'e', '6181', '3909', 'u']
Output (English): efBj7319oO3981s12499693ue6181