  We used point-contact tunnelling spectroscopy to study the superconducting
pairing symmetry of electron-doped $Nd_{1.85}Ce_{0.15}CuO_{4-y}$ (NCCO) and
hole-doped $La_{1.89}Sr_{0.11}CuO_{4}$ (LSCO). Nearly identical spectra without
zero bias conductance peak (ZBCP) were obtained on the (110) and (100) oriented
surfaces (the so-called nodal and anti-nodal directions) of NCCO. In contrast,
LSCO showed a remarkable ZBCP in the nodal direction as expected from a d-wave
superconductor. Detailed analysis reveals an s-wave component in the pairing
symmetry of the NCCO sample with $\Delta/k_BT_c=1.66$, a value remarkable close
to that of a weakly coupled BCS superconductor. We argue that this s-wave
component is formed at the Fermi surface pockets centered at ($\pm\pi$,0) and
(0,$\pm\pi$) although a d-wave component may also exist.
