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#include <iostream>

int main(){
    int frequency, length;
    std::cin >> frequency >> length;
    
    int R = 1;
    for (int i=0; i<length; i++)
    {
        if (R == 1)
            std::cout << 'R';
        else
            std::cout << 'W';
            
        if ((i+1) % frequency == 0)
            R = ~R;
    }
    
    return 0;
}