n=input() a=int(n[0]) b=int(n[1]) c=int(n[2]) d=int(n[3]) e=int(n[4]) f=int(n[5]) list=["A","B","C","D","E","F","G","H","I","J"] a1=list[a] if b%2==0: b1=int(b/2) else: b1=b c1=(a+b+c)%10 e1=(ord("l")+ord("e")+e)//10%10 f1=(a+b+c+d+e+f)%10 print(a1+str(b1)+str(c1)+str(d)+str(e1)+str(f1))