Switzerland has four official languages: German, French, Italian, and Romansh.
When native speakers of one or more of these languages meet, they follow certain regulations to choose a language for the group. Here are the rules for groups of exactly three people:
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When all three are native speakers of the same language, it also becomes their group's language.
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When two are native speakers of the same language, but the third person speaks a different language, all three will converse in the minority language.
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When native speakers of three different languages meet, they eschew these three languages and instead use the remaining of the four official languages.
The languages are encoded by the letters D for Deutsch, F for Français, I for Italiano, and K for Rumantsch.
Your task is to write a function that takes a list of three languages and returns the language the group should use.
Examples:
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The language for a group of three native French speakers is French:
FFF→F -
A group of two native Italian speakers and a Romansh speaker converses in Romansh:
IIK→K -
When three people meet whose native languages are German, French, and Romansh, the group language is Italian:
DFK→I