Task: Program Execution
Input (English): 10, 21, ['M', '6149', '7521', 'B', '2055', 'D', '4137', 'S', '9051', 'h', 'R', '7203', '9315', '4605', 'R', '2123', 'd', 'S', 'L', 'u', 'N']
Output (English): hR720393154605R2123dSLuN