# include <stdio.h>
int main ()
{
int E,J1,J2;
int a,b,c,d;
int C1, C2;
int soma1, soma2, soma3;
soma1= J1+J2;
scanf("%d %d %d", &E, &J1, &J2);
if((E==0 && soma1%2==0)||(E==1 && soma1%2!=0))
{ C1==a; printf("J1");
}
if((E==1 && soma1%2==0)||(E==0 && soma1%2!=0))
{C1==b; printf("J2");
}
int E1, J3, J4;
soma2= J3+J4;
scanf("%d %d %d", &E1, &J3, &J4);
if((E==0 && soma1%2==0)||(E==1 && soma1%2!=0))
{ C2==c; printf("J3");
}
if((E==1 && soma1%2==0)||(E==0 && soma1%2!=0))
{C2==d; printf("J4");
}
int E2,JC1, JC2, vitoria;
soma3= JC1+JC2;
scanf("%d %d %d", &E2, &JC1, &JC2);
if((E==0 && soma1%2==0)||(E==1 && soma1%2!=0))
{ C1=vitoria;
if(C1==a)
printf("A\n");
else if(C1==b)
printf("B\n");
}
if((E==1 && soma1%2==0)||(E==0 && soma1%2!=0))
{
C2=vitoria;
if(C2==c)
printf("C\n");
else if (C2==d)
printf("D\n");
}
return 0;
}
