diff --git a/io.c b/io.c
index 80d29a80db5ee2e2dfb6a3782eba5a067b55f1cc..b158637d15856b8384cf4dd27d3b8bafbfda8a9d 100644
--- a/io.c
+++ b/io.c
@@ -1,5 +1,5 @@
 /* io.c */
-/* Last Change: 2019/06/02 (Sun) 23:28:03. */
+/* Last Change: 2019/06/02 (Sun) 23:53:02. */
 
 #include<stdio.h>
 #include"io.h"
@@ -101,7 +101,7 @@ void print_answer(void){
 	printf("SIZE %dX%d\n",w,h);
 	for(i=0;i<h;i++){
 		for(j=0;j<w;j++){
-			printf("%d",board_data[i][j]);
+			printf("%d",board_data[j][i]);
 			if(j==h-1)
 				printf("\n");
 			else