Concatenar dos archivos

Hay dos archivos con texto. El primero tiene todas las líneas enumeradas como en el ejemplo a continuación:
1. Individuals and Interactions Over Processes and Tools
2. Working Software Over Comprehensive Documentation
3. Customer Collaboration Over Contract Negotiation
4. Responding to Change Over Following a Plan
El segundo solo tiene líneas una tras otra. Se te pide que fusiones el segundo en el primero, continuando la enumeración y agregando las líneas del segundo archivo.
La entrada contiene dos líneas: el nombre del primer archivo y el nombre del segundo.
El programa debe fusionar los archivos.
Input
doc.txt
second.txt

doc.txt
1. Individuals and Interactions Over Processes and Tools
2. Working Software Over Comprehensive Documentation
3. Customer Collaboration Over Contract Negotiation
4. Responding to Change Over Following a Plan

second.txt
Customer satisfaction through early and continuous software delivery
Accommodate changing requirements throughout the development process
Frequent delivery of working software
Collaboration between the business stakeholders and developers throughout the project
Support, trust, and motivate the people involved
Enable face-to-face interactions
Working software is the primary measure of progress
Agile processes to support a consistent development pace
Attention to technical detail and design enhances agility
Simplicity
Self-organizing teams encourage great architectures, requirements, and designs
Regular reflections on how to become more effective

Resulting doc.txt
1. Individuals and Interactions Over Processes and Tools
2. Working Software Over Comprehensive Documentation
3. Customer Collaboration Over Contract Negotiation
4. Responding to Change Over Following a Plan
5. Customer satisfaction through early and continuous software delivery
6. Accommodate changing requirements throughout the development process
7. Frequent delivery of working software
8. Collaboration between the business stakeholders and developers throughout the project
9. Support, trust, and motivate the people involved
10. Enable face-to-face interactions
11. Working software is the primary measure of progress
12. Agile processes to support a consistent development pace
13. Attention to technical detail and design enhances agility
14. Simplicity
15. Self-organizing teams encourage great architectures, requirements, and designs
16. Regular reflections on how to become more effective
Ten en cuenta que los nombres de los archivos se proporcionan en la entrada y no siempre son doc.txt o second.txt.
 

Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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