t=int(input())
i = 0
for _ in [0]*t:
 s=input()
 while len(s)!=1:
  s2=""
  while i < len(s) - 1:
   t=int(s[i])+int(s[i+1])
   if t//10!=0:t=t%10+t//10
   s2+=str(t)
   i+=1
  i = 0
  s=s2
 print(s)