YoungProgrammer

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

int com(const void *a, const void *b) {
	return *(char*)a - *(char*)b;
}

int getReverseNumber(int n) {
	char num[100];
	sprintf(num,"%d",n);
	qsort(num,strlen(num),1,com);
	return atoi(num);
}

void findResult(int n) {
	int max = 0, m, rev;
	for(int i = 0; i<n; i++) {
		scanf("%d",&m);
		rev = getReverseNumber(m);
		if(rev > max) max = rev; 
	}
	printf("%d\n",max);
}
int main() {
	int n;
	while(scanf("%d",&n) && n) {
		findResult(n);
	}
	return 0;
}