java:

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		int flag = sc.nextInt();
		int n = sc.nextInt();
		String[] s= new String[n+1];
		for(int i = 0; i <= n; i++) {
			s[i] = sc.nextLine();
		}
		if(flag == 1) {
			for(int i = 0; i <= n; i++) {
				if(s[i].contains(str)) {
					System.out.println(s[i]);
				}
			}
		}else {
			for(int i = 0; i <= n; i++) {
				if(s[i].toLowerCase().contains(str.toLowerCase())) {
					System.out.println(s[i]);
				}
			}
		}
	}
}
 

c++:

#include <iostream>
#include <string>
using namespace std;
int main()
{
    string a,b[101],c[101];
    int i,j,n,f;
    cin>>a;
    cin>>f>>n;
    for(i=0;i<n;i++)
    {
        cin>>b[i];
        c[i]=b[i]; 
    }
    if(f==0)
    {
        for(i=0;a[i]!='\0';i++)
        {
            if(a[i]>='A'&&a[i]<='Z')
                a[i]=a[i]+32;
        }
        for(i=0;i<n;i++)
        {
            for(j=0;b[i][j]!='\0';j++)
            {
                if(b[i][j]>='A'&&b[i][j]<='Z')
                    c[i][j]=b[i][j]+32;
            }
        }
        for(i=0;i<n;i++)
        {
            for(j=0;j<=b[i].length()-a.length();j++)
                if(c[i].substr(j,a.length())==a)
                {
                    cout<<b[i]<<endl;
                    break;
                }
          }
    }
    else
    {
        for(i=0;i<n;i++)
        {
            for(j=0;j<=b[i].length()-a.length();j++)
                if(b[i].substr(j,a.length())==a)
                {
                    cout<<b[i]<<endl;
                    break;
                }
        }
    }
    return 0;
}