# your code goes here
t = int(raw_input())
for h in range(t):
m = [int(x) for x in raw_input().split()]
x,y = m[0],m[1]
x = list(str(x))
y = list(str(y))
x.reverse()
y.reverse()
x1,y1 = '',''
#print x,y
for i in x:
#print i,
x1+=i
for i in y:
y1+=i
#print x1,y1
k = list(str(int(x1)+int(y1)))
k.reverse()
#print k
s = ''
for i in k:
s+=i
print int(s)
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