#include <iostream>
#include<string.h>
#define SIZE 2000000
int main() {
	freopen("strmatch.in", "r", stdin);
	freopen("strmatch.out", "w", stdout);
	char * w1=(char*)malloc(SIZE);
	char * w2=(char*)malloc(SIZE);
	
	scanf("%s %s",w1,w2);
	int * v=(int*)malloc(sizeof(int)*strlen(w1));
	int * c=(int*)malloc(sizeof(int)*strlen(w2));
	v[0]=0;
	int vindex=1,len=0;
	while (vindex < strlen(w1))
    {
       if(w1[vindex]==w1[len]){
       		len++;
       		v[vindex]=len;
       		vindex++;
       }else{
       	if(len!=0){
       		len=0;
       	}else{
	       	v[vindex]=0;
	       	vindex++;
       	}
       }
    }
    
    int w1len=strlen(w1);
    int w2len=strlen(w2);
    int i=0,j=0,count=0;
    while(j<w2len){
    	//cout<<w1[i]<<" "<<w2[j]<<endl;
    	if(w1[i]==w2[j]){
    		i++;j++;
    	}

    	if(i==w1len){
    		c[count++]=j-w1len;
    	        i = v[i-1];
        }else if (j < w2len && w2[j] != w1[i]){
          if (i != 0)
           i = v[i-1];
          else
           j++;
        }
    }
    printf("%d\n",count);
	if(count>1000)count=1000;
    for(i=0;i<count;i++){
    	printf("%d ",c[i]);
    }
    
	
}