Python:

s1=input('nhap xau thu nhat: ')
s2=input('nhap xau thu hai: ')
if (s2[0]==s1[len(s1)-1]):
    print('ki tu thu nhat cua xau thu hai trung voi ki tu cuoi cung cua xau thu nhat')
else:
    print('ki tu thu nhat cua xau thu hai khong trung voi ki tu cuoi cung cua xau thu nhat')

C++:

#include <iostream>
#include <string.h>
std::string s1,s2;
int main()
{
    std::cout << "nhap xau thu nhat: ";
    getline(std::cin,s1);
    std::cout << "nhap xau thu hai: ";
    getline(std::cin,s2);
    if (s1[s1.size()-1] == s2[0])
    {
        std::cout << "ki tu thu nhat cua xau thu hai trung voi ki tu cuoi cung cua xau thu nhat";
    }
    else
    {
        std::cout << "ki tu thu nhat cua xau thu hai khong trung voi ki tu cuoi cung cua xau thu nhat";
    }
}

$\color{red}{\text{#Daoanhviet96}}$

var s1, s2 : string; d : byte;

begin

clrscr;

write('Nhap xau s1 = '); readln(s1);

write('Nhap xau s2= '); readln(s2);

d := length(s1);

if s1[d] <> s2[1]

then write('Ki tu cuoi s1 khong trung ki tu dau s2')

else write('Ki tu cuoi s1 trung ki tu dau s2');

readln

end.