题解 | #删除字符串中出现次数最少的字符#

s = input().strip()
strMap = {}
for i in s:
    if i in strMap:
        strMap[i] += 1
    else:
        strMap[i] = 1
for kv in strMap:
    if strMap[kv] == min(strMap.values()):
        s = s.replace(kv, "")
print(s)