public class Main {
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public static void main(String[] args){
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Scanner sc=new Scanner(System.in);
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char []a={'1','0','x','9','8','7','6','5','4','3','2'};
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int[] c={7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};
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String s=new String();
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s=sc.nextLine();
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char[] ch=s.toCharArray();//char []ch1=sc.next().toCharArray();
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char[] c1=new char[20];
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System.arraycopy(ch, 0, c1, 0, ch.length);
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for(int i=14;i>=6;i--){
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c1[i+2]=c1[i];
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}
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c1[6]='1';
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c1[7]='9';
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int sum=0;
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for(int i=0;i<=16;i++){
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sum+=(int)(c1[i]-'0')*c[i];//字符-‘0’表示将字符转换为数字
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}
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sum%=11;
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for(int i=0;i<17;i++)
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System.out.PRint(c1[i]);
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System.out.println(a[sum]);
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}
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}
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