#include<stdio.h>
int main()
{
    int t[2],a,b,c,d;
    for(int i=0;i<10;i++)
        {
            scanf("%d",&a);
            if(t[0]==0)
            {
                t[0]=a;
            }
            else if(t[1]==0)
            {
                t[1]=a;
            }
            else if(a==t[0] || a==t[1])
            {
                d++;
                t[0]=t[1];
                t[1]=a;
            }
        }
    printf("%d",a);
}

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