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#include 

using namespace std;



#include 



bool CheckIsReal(int thesum,int thei);



int main()

{



	string ID;

	

	

	while (cin>>ID)

	{

		int sum=0; 

		

		for(int index=0,mul=8;mul>=1;index++,mul--)

		{

			sum += ( (ID[index]-(int)'0') * mul );

		}

		sum += (ID[8]-'0');  //最後一位數  千萬要注意'8'跟數字8是不同的！！



		for(int i=0;i<=25;i++)

		{

			if (CheckIsReal(sum,i))

				cout<<(char)(i+'A');

		}

		cout<	}

	

	

	return 0;

}



bool CheckIsReal(int thesum,int thei)

{

	int v[]= 

	{ 10, 11, 12, 13, 14, 15, 16, 17, 34, 18, 19, 20, 21,

	22, 35, 23, 24, 25, 26, 27, 28, 29, 32, 30, 31, 33};

	int temp=0;

	thesum += v[thei] / 10 ;

	thesum += (v[thei]%10)*9;

	if (thesum%10==0)

		return 1;

	else 

		return 0;

}