#include<stdio.h>
int main(){
int x,y;
while(scanf("%d%d",&x,&y)!=EOF){
int max=x<y?y:x;
int min=x+y-max;
while(max>min){
max/=2;
}
if(max==min)
printf("%d\n",min);
else{
while(min!=max){
if(min>max)
min/=2;
else
max/=2;
}
printf("%d\n",min);
}
}
}
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