Triangle type

You are given the lengths of three segments: $a$, $b$, $c$. Can they form a triangle? If they can, determine its type (the answer is in Uzbek, exactly one of these lines):

• teng tomonli — equilateral, all three sides are equal;
• teng yonli — isosceles, exactly two sides are equal;
• turli tomonli — scalene, all sides are different;
• mavjud emas — no triangle exists.

A triangle exists when every side is strictly less than the sum of the other two. $1, 2, 3$ does not form one: $1 + 2 = 3$, so the segments lie on one line.

A single line with three integers $a$, $b$, $c$ ($1 \le a, b, c \le 2 \cdot 10^9$).

One of the lines: teng tomonli, teng yonli, turli tomonli, mavjud emas.

Check existence first, then the type. The numbers themselves fit into a 32-bit int, but $a + b$ reaches $4 \cdot 10^9$, which no longer fits into an int — use long long in C++ and int64 in Go.