Sample input for the PHONON (ph.x) program 
 &INPUTPH
 verbosity = 'medium'
                    amass(1) = 1.000000,
                    amass(2) = 2.000000,
                    amass(3) = 3.000000,
                      prefix = 'pwscf' ,
 /
0.000000 0.000000 0.000000