Task: Program Execution
Input (English): mXSDqYhdzAgLuKcfkITBrXKag, UIrJriISDqYhdzAgLuKcfkITBrXLtoIgbDmXSDCbggA
Output (English): mXabcddfghikklqrstuxyzKag, UIrJriIabcddfghikklqrstuxyzLtoIgbDmXSDCbggA