#include<stdio.h>

int yukuri(int,int);
main(){
int m,n;

printf("??ツ?フ???????ヘ?ケ???,?");
scanf("%d,%d",&m,&n);

printf("?ナ??????ヘ%d?ナ?キ\n",yukuri(m,n));
}

int yukuri(int m1,int n1){ /*???[?N???b?h?ン???@(??ォ?Z)*/
if(m1==n1){
return m1;
}
else if(m1>n1){
return yukuri(m1-n1,n1);
}
else{
return yukuri(m1,n1-m1);
}
}

/*finish!!*/