there stre s consist capital latin letter let denote current length s during allow apply follow operation insert pos ch insert letter ch string s position pos 1poss1achz the letter ch posth symbol string s letter shift aside length string increase 1 delete pos delete character number pos 1poss string s at letter shift length string decrease 1 replace pos ch letter position pos line s replace ch 1possachz at length string change your task find minimal number move t string s string you find sequence action lead require result