Latex input a Greek letter

Mathematical formulas cannot be separated from Greek letters. The following lists the control commands for generating Greek letters in latex: \ Alpha generates Alpha; \ beta generates Beta; \ gamma generates gamma; \ Delta generates delta; \ Epsilon generates ε; \ ε generates |; \ ETA generates the character ETA; \ Theta generates the character 9; \ iota generates the character escape t; \ Kappa generates the character Kappa; \ 1amta generates the character λ; \ Mu generates the character μ; \ Xi generates the character ε: \ nu to generate the character ν; \ O to generate the character o; \ pi to generate the character π; \ rock to generate the character P; \ sigma to generate the character σ; \ Tau generate Characters ?; \ Upsilon generates the character seek; \ Phi generates the character Phi; \ Chi generates the character seek; \ PSI generates the character token; \ Omega generates the character ω.