#include <cstdio>

#define FOR(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define REV(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define INC0(i, n) FOR(i, 0, n)
#define INC1(i, n) FOR(i, 1, (n) + 1)
#define DEC0(i, n) REV(i, 0, n)
#define DEC1(i, n) REV(i, 1, (n) + 1)

typedef long long   signed int LL;
typedef long long unsigned int LU;


int n, d[9];

int swap(int x, int y, int len) {
	int a[9];
	INC0(i, len) { a[i] = d[i]; }
	
	int temp = a[x];
	a[x] = a[y];
	a[y] = temp;
	
	int ans = 0, p = 1;
	INC0(i, len) { ans += a[i] * p; p *= 10; }
	
	return ans;
}

int main() {
	scanf("%d", &n);
	
	int i = 0, t = n, len;
	while(t != 0) {
		d[i] = t % 10;
		t /= 10;
		i++;
	}
	len = i;
	
	int max = n;
	
	INC0(i, len) {
	INC0(j, i) {
		int s = swap(i, j, len);
		if(max < s) { max = s; }
	}
	}
	
	printf("%d\n", max);
	
	return 0;
}