#include<iostream>
using namespace std;
int main()
{
	int n,sum,f,i;
	char a[20];
	while(scanf("%s",a)!=EOF)
	{
		f=sum=0;
		for(i=0;i<10;i++)
		{
			if(a[i]=='?')
			{
				n=i;
				a[i]=0;
				continue;
			}
			if(a[i]=='X'||a[i]=='x')
				a[i]=10;
			else
				a[i]=a[i]-'0';
			sum+=(10-i)*a[i];
		}
		while(sum%11)
		{
			sum+=(10-n);
			a[n]++;
			if(a[n]>10||(n!=9&&a[n]==10))
			{
				f=1;
				break;
			}
		}
		if(f==1)
			printf("-1\n");
		if(a[n]==10&&!f)
			printf("X\n");
		else
			printf("%d\n",a[n]);
	}
	return 0;
}

• Re:不知咋错了~~郁闷~~ (678) 61886510 2011-07-11 19:34:14