from sys import stdin
def judge(filename, currYear):
f = stdin
n = int(f.readline())
for i in range(n):
Y = {}
m = int(f.readline())
for j in range(m):
years = str.split(f.readline())
start = int(years[0])
stop = int(years[1] if len(years) > 1 else currYear)
for k in range(start, stop+1):
if k not in Y: Y[k] = 0
Y[k] += 1
x = max(Y.values())
print sorted([y[0] for y in Y.items() if y[1] == x])
judge("judge.txt", 2015)
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