How to extract substrings from this input: 

```
input = c("Inspecting sequence ID   NM_000775",    
          "Inspecting sequence ID   NM_001014975", 
          "Inspecting sequence ID   NM_001080484")  

```

to get:

```
output= c("NM_000775",  "NM_001014975", "NM_001080484")

```