https://www.acmicpc.net/problem/5800
k = int(input())
for i in range(k):
nums = list(map(int, input().split()))
n = nums[0]
score = nums[1:]
score.sort()
gap = [score[i + 1] - score[i] for i in range(n - 1)]
print(f"Class {i + 1}")
print(f"Max {max(score)}, Min {min(score)}, Largest gap {max(gap)}")