Task: Program Execution
Input (English): 15, 20, ['4303', 'u', 'b', 'D', '3015', '6703', '2245', '1377', '4409', '1573', '7709', '3773', 'D', '4793', '1925', '9867', '3181', 'Z', '4613', 'Y', 'Q', '4203']
Output (English): Y4613Z318198671925