In a certain code language, 'That was his sister' is coded as 'Bo Uv Zs Mn', 'This was his cat' is coded as 'Zs Pt Uv Ga' and 'That was my father' is coded as 'Bo Uv Ex Yz'. What is the code for 'sister' in this code language?
एक निश्चित कूट भाषा में, 'That was his sister' को 'Bo Uv Zs Mn' कूटबद्ध किया जाता है, 'This was his cat' को 'Zs Pt Uv Ga' कूटबद्ध किया जाता और 'That was my father' को 'Bo Uv Ex Yz' कूटबद्ध किया जाता है। उसी भाषा में 'sister' का कूट क्या है?