#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int P1 = 1000021;
const int P2 = 1000007;
const int B1 = 101 ;
const int B2 = 103 ;
const int N = 2000007;
char a[N], b[N], o[N];
int n, m, val1, val2, nr;
int x, y, r, t;
int main() {
	freopen("strmatch.in", "r", stdin);
	freopen("strmatch.out", "w", stdout);

	int i;

	scanf("%s %s", &a, &b);

	n = strlen(a);
	m = strlen(b);
	val1 = val2 = 1;
		for( i = 0; i < n; ++i) {
			x = ( x * B1 + a[i] ) % P1;
			r = ( r * B2 + a[i] ) % P2;
			if( i != 0) {

				val1 = ( val1 * B1 ) % P1;
				val2 = ( val2 * B2 ) % P2;
			}
		}

		for ( i = 0; i < n; ++i ) {
			y = ( y * B1 + b[i] ) % P1;
			t = ( t * B2 + b[i] ) % P2;
		}
        b[m]='0'-1;
		for( i = n; i <= m; ++i) {
			if( x == y && r == t ) {
				++nr;
				o[i-n]=1;
			}

			y = ( y -  b[i-n] * val1 ) % P1 + P1; y = ( ( y * B1 ) + b[i] ) % P1 ;
			t = ( t -  b[i-n] * val2 ) % P2 + P2; t = ( ( t * B2 ) + b[i] ) % P2 ;
		}
	 printf("%d\n", nr);
     nr = 0;
	 	for( i = 0; i< m && nr <= 1000; ++i )
            if( o[i] )
			++nr, printf("%d ",i);
	return 0;
}