Given two strings, find if one string is a sub-sequence of the other.
String 1: abcd
String 2: abcde
The first string "abcd" is a sub-sequence of the second string "abcde".
Complete the following task based on the instruction and optional input provided.### Instruction:
Given two strings, find if one string is a sub-sequence of the other.

### Input:
String 1: abcd
String 2: abcde

### Output:
The first string "abcd" is a sub-sequence of the second string "abcde".