PHANTU C++

#include <bits/stdc++.h>
using namespace std;

string a,b,c;
int n,m;

void nhap()
{
    getline(cin,a);
    getline(cin,b);
    n = a.length();
    m = b.length();
}
void cau_1()
{
    if(a[n-1]==b[0]) cout << "Yes" << endl;
    else cout << "NO" << endl;
}

void cau_2()
{
    int d=0;
    for(int i=0;i<n;i++)
        if(b[0]==a[i]) d++;
    cout << d <<endl;
}

void cau_3()
{
    for(int i=n-1;i>=0;i--)
        cout << a[i];
    cout << endl;
}

void cau_4()
{

    for(int i=0;i<m;i++)
    {
        if(b[i]!=' ') cout << b[i];
    }
    cout << endl;
}

Void cau_5()
{
    c="";
    for(int i=0;i<n;i++)
        if((a[i]>='0')&&(a[i]<='9'))
            c=c+a[i];
    cout << c << endl;
}

void cau_6()
{
    bool kt=true;
    int k = c.length();
    for(int i=0;i<k/2;i++)
        if(c[i]!=c[k-1-i]) kt=false;
    if(kt) cout << "Yes";
    else cout << "No";
}
int main()
{
    freopen("phantu.inp","r",stdin);
    freopen("phantu.out","w",stdout);
    nhap();
    cau_1();
    cau_2();
    cau_3();
    cau_4();
    cau_5();
    cau_6();
}