When using winter's method for forecasting, what method should be used to determine the initial parameters (alpha,beta,gamma)? Where c is the cycle. Please include an example dataset to use as an example. (can be rudimentary)

Thank you in advance :)

Xt = St-c Lt = a + (1 - a)(Lt-1 + Tt-1) Tt = B(L+ Lt-1) + (1 B)Tt-1 St = y + (1 - y)st-c Lt-1+Tt-1 xt Xt = St-c Lt = a + (1 - a)(Lt-1 + Tt-1) Tt = B(L+ Lt-1) + (1 B)Tt-1 St = y + (1 - y)st-c Lt-1+Tt-1 xt