import java.util.*;

public class RandomString extends Random {

	public RandomString( long seed ) { super( seed ); }

	public String nextString( int maxlen ) {
		int n = nextInt( maxlen + 1 );
		char c[] = new char[n];
		for ( int i = 0; i < n; i++ )
			c[i] = (char) ( 32 + nextInt( 128 - 32 ));
		return new String( c );
	}
	
	public static void main( String args[] ) { 
		RandomString rs = new RandomString( 1000 );
		String s = rs.nextString( Integer.parseInt( args[0] ) );
		System.out.println( s );
	}
	
}