import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

t = I()

def c(s):
    n = []
    for i in range(len(s)-1):
        a = int(s[i])
        b = int(s[i+1])
        if a + b >= 10:
            n.append(1 + (a+b)%10)
        else:
            n.append(a + b)
    return "".join(map(str, n))

for _ in range(t):
    s = S()
    while len(s) > 1:
        s = c(s)
    print(s)