#include <stdio.h>
int main() {
int A, B, C;
scanf("%d", &A);
scanf("%d", &B);
scanf("%d", &C);
if(A!=B && A!=C){
printf("A");
}
else if(B!=A && B!=C){
printf("B");
}
else if(C!=A && C!= B){
printf("C");
}
else{
printf("*");
}
return 0;
}
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