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- #include<stdio.h>
- int main()
- {
- int arr[109];
- int n, t, i;
- while( scanf("%d%d",&n,&t) ==2)
- {
- if(t<10)
- {
- for(i=0; i<n; i++)
- {
- arr[i]=t;
- }
- }else if(t==10)
- {
- arr[0]=1;
- for(i=1; i<n; i++)
- {
- arr[i]=0;
- }
- }
- if(n==1 && t>1)
- {
- printf("%d\n",-1);
- }else
- {
- for(i=0; i<n; i++)
- {
- printf("%d",arr[i]);
- }
- printf("\n");
- }
- }
- return 0;
- }
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