I did this in the command line: 
`ecm 1 < number` 
Here `number` is the file containing value 121. This is the result I got.
```
thilinarmtb@debian:~/Repos/CSymPy$ ecm 1 < number 
GMP-ECM 6.4.4 [configured with GMP 5.0.5, --enable-asm-redc] [ECM]
Input number is 121 (3 digits)
********** Factor found in step 1: 121
Found input number N
```
And with a different B1 value (100)
```
thilinarmtb@debian:~/Repos/CSymPy$ ecm 100 < number 
GMP-ECM 6.4.4 [configured with GMP 5.0.5, --enable-asm-redc] [ECM]
Input number is 121 (3 digits)
Using B1=100, B2=2046, polynomial x^1, sigma=3413231836
Step 1 took 0ms
********** Factor found in step 1: 121
Found input number N
```