#include stdio.h#include string.hint main(){char a[101];char b[101];printf(输入字符串);gets(a);int lenstrlen(a);int k0;for(int i0;ilen;i){int flag0;for(int j0;jk;j){if(a[i]b[j]){flag1;}}if(!flag){b[k]a[i];}}b[k]\0;printf(%s,b);return 0;}