题解 | #字符统计#
字符统计
https://www.nowcoder.com/practice/c1f9561de1e240099bdb904765da9ad0
ipt = input()
ct = {}
for i in ipt:
ct[i] = ct.get(i, 0) + 1
l1 = sorted(ct.items())
l2 = sorted(l1, key=lambda x: x[1], reverse=True)
print("".join([str(i[0]) for i in l2]))