1 no.

#include<stdio.h>
int main()
{
    int n,k,ans=0,j=0;
    scanf("%d%d",&n,&k);

    int a[n],b[n];
    for(int i=0;i<n;i++)
        scanf("%d",&a[i]);         /* n=5,k=3;
                                     1 2 3 3 3
                                     3
                                    3 4 5;*/
    //printf("%d ",a[i]);}
    for(int i=0;i<n;i++){
        if(a[i]==k) ans++;
        //printf("%d\n",ans);
        if(ans>0) {
          b[j]=i+1;
          j++;
        }
    }
    if(ans==0) printf("Such data is not exists\n");
    else {
        printf("%d\n",ans);
        for(int i=0;i<ans;i++) printf("%d ",b[i]);
        printf("\n");
    }
}