#!/usr/bin/env python
import sys
INPUT = 'rev.inp'
def rev(num):
return int(str(num)[::-1])
def main(fname):
f = file(fname)
try:
length = int(f.readline())
except ValueError:
print "what a shit"
sys.exit(1)
for i in xrange(length):
one, two = f.readline().split()
print rev(rev(one) + rev(two))
if __name__ == '__main__':
main(INPUT)