题解 | #合并区间#

intervals = input().split()
intervals = [i.split(',') for i in intervals]

intervals_post = [[int(j) for j in i] for i in intervals]

intervals_post.sort(key=lambda x:x[0])
ivt = []
change = 0
for idx,i in enumerate(intervals_post):
    if ivt==[]:
        ivt += [i]
    else:
        if i[1]>ivt[-1][1] and i[0]<=ivt[-1][1]:
            ivt[-1][1] = i[1]
        elif i[0]>ivt[-1][1]:
            ivt += [i]
ivt = [','.join([str(j) for j in i]) for i in ivt]
ivt = ' '.join(ivt)
print(ivt)