Strings 

C++ provides a nice alternative data type to manipulate strings, and the data type is conveniently called string. Some of its widely used features are the following:

• Declaration:

  string a = "abc";
  

• Size:

  int len = a.size();
  

• Concatenate two strings:

  string a = "abc";
  string b = "def";
  string c = a + b; // c = "abcdef".
  

• Accessing  element:

  string s = "abc";
  char   c0 = s[0];   // c0 = 'a'
  char   c1 = s[1];   // c1 = 'b'
  char   c2 = s[2];   // c2 = 'c'
  
  s[0] = 'z';         // s = "zbc"
  

P.S.: We will use cin/cout to read/write a string.

Input Format

You are given two strings,  and , separated by a new line. Each string will consist of lower case Latin characters ('a'-'z').

Output Format

In the first line print two space-separated integers, representing the length of  and  respectively.
In the second line print the string produced by concatenating  and  ().
In the third line print two strings separated by a space,  and .  and  are the same as  and , respectively, except that their first characters are swapped.

Sample Input

abcd
ef

Sample Output

4 2
abcdef
ebcd af

Explanation

 "abcd"
 "ef"

 "abcdef"
 "ebcd"
 "af" 

SOLUTION:

#include <iostream>

#include <string>

using namespace std;

int main()

{

  string a,b;

    cin>>a;

    cin>>b;

    int len1 = a.size();

    int len2 = b.size();

    cout<<len1<<" "<<len2<<endl;

    cout<<a<<b<<endl;

    char c;

    c=a[0];

    a[0]=b[0];

    b[0]=c;

    cout<<a<<" "<<b;

    return 0;

}