import sys
ctr=0
up=raw_input()
tocal=raw_input()
while ctr!=int(up):
l=tocal.split(' ')
num1=int(l[0][::-1])
num2=int(l[1][::-1])
sum=num1 + num2
rsum=str(sum)[::-1].ltrim('0')
print rsum
ctr+=1
tocal=raw_input()
sys.exit(0)
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