def add_votes(results, name, votes):
    if name in results:
        results[name] += votes
    else:
        results[name] = votes


n = int(input())
results = {}
for i in range(n):
    name, votes = input().split()
    add_votes(results, name, int(votes))

for name in sorted(results):
    print(name, results[name])