A country has a budget of more than 81 trillion yen. We want to process such data, but conventional integer type which uses signed 32 bit can represent up to 2,147,483,647.  Your task is to write a program which reads two integers (more than or equal to zero), and prints a sum of these integers.  If given integers or the sum have more than 80 digits, print "overflow".
times=int(input())
for i in range(times):
    a=int(input())
    b=int(input())
    if int((a+b)/(1e80))!=0:
        print("overflow")
    else: print(a+b)
times=int(input())
for i in range(times):
    a=int(input())
    b=int(input())
    if len(str(a))<=80 and len(str(b))<=80 and len(str(a+b))<=80:
        print(a+b)
    else: print("overflow")