أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ [مِئَةَ مَرَّةٍ اليَوْمِ]

I seek Your forgiveness, Allāh, and repent unto You.

Reference: I seek Your forgiveness, Allāh, and repent unto You. Al-Bukhārī (#6307, 11/101) and Muslim (#2702, 4/2075).