Task: Program Execution
Input (English): r 7651 Z 3007 7877 5705 4903 747 1923 W 9887 5213 8077 J s T 8531 B 149 a 9147 L I M W 1781 l 1897 9699 t E P I 2991 5189 W x Z c y
Output (English): 18