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)