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#Lua, 93 78 Bytes
a=io.read()m=a:sub(1,1):upper()print(({a:gsub("["..m..m:lower().."]","")})[1])
#Lua, 5493 78 Bytes
a=io.read()m=a:lowersub(1,1):upper()print(({a:gsub(a"["..m..m:sublower(1,1).."]","")})[1])
#Lua, 54 Bytes
a=io.read():lower()print(({a:gsub(a:sub(1,1),"")})[1])
