#include<cstdio>
#include<cstring>
#define MAX_LEN 2000000
#define MAX_POS 1000

char P[MAX_LEN+1], T[MAX_LEN+1];
int pi[MAX_LEN+1], pos[MAX_POS], n, m, nrp;

void read() {
    FILE* fin = fopen("strmatch.in","r");
    fscanf(fin,"%s%s",P,T);
    m = strlen(P);
    n = strlen(T);
    fclose(fin);
}

void buildPrefix() {
    int i, k = 0;
    pi[0] = 0;
    for(i = 1; i < m; i++) {
        while(k > 0 && P[i] != P[k])
            k = pi[k-1];
        if(P[i] == P[k])
            k++;
        pi[i] = k;
    }
}

void KMP() {
    int i, k = 0;
    for(i = 0; i < n; i++) {
        while(k > 0 && T[i] != P[k])
            k = pi[k-1];
        if(T[i] == P[k])
            k++;
        if(k == m) {
            if(nrp < MAX_POS)
                pos[nrp++] = i - m + 1;
            else nrp++;
        }
    }
}

void printAp() {
    int i;
    FILE* fout = fopen("strmatch.out","w");
    fprintf(fout,"%d\n",nrp);
    if(nrp > MAX_POS)
        nrp = MAX_POS;
    for(i = 0; i < nrp; i++)
        fprintf(fout,"%d ",pos[i]);
    fprintf(fout,"\n");
    fclose(fout);
}

int main() {
    read();
    buildPrefix();
    KMP();
    printAp();
    return 0;
}