st = [input() for i in range(int(input()))]
for s in st:
 while len(s)!=1:
  s2=""
  for i in range(len(s)-1):
   t=int(s[i])+int(s[i+1])
   t=t%10+t//10
   s2+=str(t)
  s=s2
 print(s)