#include <cstdio>
#include <cstring>
using namespace std;

const int DIM = (1<<20);

int N, M, i, j, k, k2, R, L;
int Z[DIM*2], Sol[2048], nr;
char A[DIM], B[DIM], S[DIM*2];

int main(){

    freopen("strmatch.in" ,"r", stdin );
    freopen("strmatch.out","w", stdout);

    scanf("%s", A + 1); N = strlen(A + 1);
    scanf("%s", B + 1); M = strlen(B + 1);

    for(int i = 1; i <= N; i ++)
        S[i+0] = A[i];

    for(int i = 1; i <= M; i ++)
        S[i+N] = B[i];

    N += M;
    Z[0] = N;

    for(int i = 2; i <= N; i ++){

        if(i > R){

            L = i;
            R = i;

            while(S[R] == S[R-L+1])
                R ++;

            Z[i] = R - L;
            R --;

        }
        else {

            int K = i - L + 1;

            if(Z[K] < R - i + 1){

                Z[i] = Z[K];

            }
            else {

                L = i;

                while(S[R] == S[R-L+1])
                    R ++;

                Z[i] = R - L;
                R --;
            }

        }

        if(Z[i] >= N - M && i > N - M && nr < 1000)
            Sol[++nr] = i - Z[i] - 1;

    }

    printf("%d\n", nr);

    for(int i = 1; i <= nr; i ++)
        printf("%d ", Sol[i]);

    fclose(stdin );
    fclose(stdout);

    return 0;
}