def solve(s):     if not s:         return ''     dic = {}     for i in s:         dic[i] = dic.get(i, 0) + 1     dic = sorted(dic.items(), key=lambda x: x[0])     res = ''     for i in dic:         res += i[0]         res += str(i[1])     return res if __name__ == '__main__':     s = input()     print(solve(s))
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