//问题出在哪里？如何解决？

include <stdio.h>

include <iostream>

using namespace std;

include <string.h>//strlen

bool IS(char arr[], int left, int right) {
int up[26] = { 0 };
int low[26] = { 0 };
for (int i = left; i < right; i++) {
if (arr[i] >= 'a'&&arr[i] <= 'z') {
low[arr[i] - 'a'] = 1;
}
else { up[arr[i] - 'A'] = 1; }
}
for (int i = 0; i < 26; i++) {
if (up[i] && low[i] == 1) return true;
}
return false;
}
int main() {
char s[100];
scanf_s("%s", s);
int n = strlen(s);
int left = 0, right = 0, count = 0;
for (int i = 0; i < n-1; i++) {
for (int j = i + 1; j < n; j++) {
if (IS(s, i, j) == true && j - i + 1 > 0) {
left = i;
right = j;
count = j - i + 1;
}
else printf(" ");
}
}
char p;
p = (char)malloc((count + 1)*(sizeof(char)));
int i = 0;
for (i; i < count; i++) {
p[i] = s[left];
left++;
}
p[i] = '\0';
printf("%s", p);
return 0;
}