View Compilation Error

0_0_31798454_16650.cpp:7:1: error: 'cosnt' does not name a type
 cosnt int MOD = 1e9+7 ; 
 ^
0_0_31798454_16650.cpp: In function 'int main()':
0_0_31798454_16650.cpp:73:78: error: 'MOD' was not declared in this scope
         rep(i, 1, n) Ans = (Ans + (ll)(i - l[i] + 1) * (ll)(r[i] - i + 1)) % MOD;
                                                                              ^