View Compilation Error

0_0_37482871_20823.cpp:49:4: error: missing terminating " character
    else if(oper[0]=='A'") Update(1,N,a,b,1,1);
    ^
0_0_37482871_20823.cpp: In function 'int main()':
0_0_37482871_20823.cpp:50:4: error: expected ')' before 'else'
    else if(oper[0]=='S') Update(1,N,a,b,1,-1);
    ^