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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class TC3
{
    static void solve( String s, int N )
    {
        String UC=s.toUpperCase();
        String LC=s.toLowerCase();
        
        for( int i=0; i<Math.min( s.length(), 27 ); i++ )
        {
            char UP=s.charAt( i );
            if( UP == UC.charAt( i ))
            {
                System.out.print( UC.charAt( i ));
                continue;
            }
                
            if( (int)( UP ) < 97+N )
                System.out.print( UC.charAt( i ));
            else
                System.out.print( LC.charAt( i ));
        }
    }
    public static void main( String[] args ) throws IOException
    {
        BufferedReader br=new BufferedReader( new InputStreamReader( System.in ));
        String s=br.readLine();
        int N=Integer.parseInt( br.readLine() );
        solve( s, N );
        System.out.println();
        
    }
    
    
}