C :

#include<stdio.h>
#include<string.h>
int main()
{
    char a[300],b[100];
    gets(a);
    gets(b);
    strcat(a,b);
    puts(a);
    return 0;
}

C++ :

#include<iostream>
#include<string.h>
using namespace std;
int main()
{
    char a[50],b[50];
    cin>>a>>b;
    cout<<strcat(a,b)<<endl;
}

Pascal :

var st,s:string;
begin
  readln(st);
  readln(s);
  writeln(st,s);
end.