Find the index of the given substring from the sentence.
Substring: “application”
Sentence: She felt so excited that her application got approval.
The index of the substring "application" in the sentence "She felt so excited that her application got approval." is 27.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find the index of the given substring from the sentence.

### Input:
Substring: “application”
Sentence: She felt so excited that her application got approval.

### Output:
The index of the substring "application" in the sentence "She felt so excited that her application got approval." is 27.