#include <stdio.h> #include <string.h> int cmp(const void* p1, const void* p2) { return *(char*)p1 - *(char*)p2; } int main() { char str[500] = {0}; scanf("%s", str); qsort(str, strlen(str), sizeof(char), cmp); int count = 1; char pre = str[0]; for(int i = 1; i < strlen(str)...