def reversa( num, tam, res) :
if ( num == 0 ) :
return res
res = ( 10 *tam) + ( num%10 )
return reversa( num//10 , tam-1 , res)
def main( ) :
a = int ( input ( ) ) - 1
while ( a != 0 ) :
b = int ( input ( ) )
c = int ( input ( ) )
d = reversa( b, len ( b) - 1 , 0 ) + reversa( c, len ( c) - 1 , 0 )
print ( reversa( d, len ( d) - 1 , 0 ) )
a = a - 1
main( )
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