=CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))&CHAR(RANDBETWEEN(33;122))
Some sample results:
BJ=72irl]9J\
7[h!i1;S9M'M
o@ffY_2e/FEH
kTy7veZOhOLJ
mc"TZEuRJ`jF
NOTE: you can modify the lenght of password using more or fewer &CHAR(RANDBETWEEN(33;122))