class Ikk6 {

public static void main ( String args[] ) {

// 変数宣言

int list[][] = { { 1, 2, 3 }, { 4, 5, 6 } };

int buf = 0;

// 3回繰り返し

for ( int i = 0; i < 3; i++ ) {

buf = list[0][i];

list[0][i] = list[1][i];

list[1][i] = buf;

}

// 2回繰り返し

for ( int i = 0; i < 2; i++ ) {

// 3回繰り返し

for ( int j = 0; j < 3; j++ ) {

System.out.print( list[i][j] + "," );

}

System.out.println();

}

}

}