include<stdio.h>

int main(){

int a,b,c,x,y;
scanf("%d%d",&a,&b);
for(x=0;x<=c/a;x++){
    y=(c-a*x)/b;
    if(a*x+b*y==c){
        printf("-1");
    }
}
printf("%d%d",x,y);
return 0;

} 求解！